Production of spherical ceramic powders
First Claim
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1. A method of producing ceramic spheres suitable for calcination to ceramic powders, which comprises:
- contacting an anhydrous alkanol sol of at least one ceramic oxide precursor with liquid with which said sol is immiscible to form spheres of said sol in said immiscible liquid, andhydrolyzing said ceramic oxide precursor in said spheres to form ceramic oxide spheres.
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Abstract
A sol-gel method is employed to produce ceramic oxide spheres from precursors thereto. An alkanol of the sol precursor(s) is introduced to an immiscible hydrophilic liquid phase to cause spheroidizing of the sol. Moisture, which initially may be present in the immiscible liquid or may subsequently be added, is employed to effect hydrolysis of the precursor to oxide form. The ceramic oxide spheres are recovered from the liquid phase and calcined to their final form.
25 Citations
17 Claims
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1. A method of producing ceramic spheres suitable for calcination to ceramic powders, which comprises:
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contacting an anhydrous alkanol sol of at least one ceramic oxide precursor with liquid with which said sol is immiscible to form spheres of said sol in said immiscible liquid, and hydrolyzing said ceramic oxide precursor in said spheres to form ceramic oxide spheres. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification